Using data from NASA's Moon Mineralogy Mapper (M3) instrument, researchers identified three chemical signatures "that definitively prove there is water ice at the surface of the Moon," said a NASA statement.The polar regions where the ice lies are "super cold," Li said, noting that the warmest temperatures never reach above minus 250 degrees Fahrenheit (-157 Celsius.It is unclear exactly how much ice exists on the surface, since the instruments could only detect ice within a few millimeters of the Moon's surface, he said. But NASA said if there is enough of the ice, "water would possibly be accessible as a resource for future expeditions to explore and even stay on the Moon."The US space agency is aiming to return humans to the Moon in the coming years for the first time since the storied Apollo missions of the 1960s and 1970s.Li said the best way to find out more about the Moon's ice and how to tap into it as a resource would be to send a robotic rover to explore the lunar poles.The full study was published in Monday's edition of the Proceedings of the National Academy of Sciences.
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